Adj. common. Inafectable by moisture. It is a hybrid made up of the Greek noun 'higrós': humidity, and the adjective "immunis': exception, free, free, free, privileged. The adjective is composed of the prefix negative 'in' ( if a "n" precedes a "m" - in Latin - it assimilates to this: becomes another "m" ) and the substantive "munus": charge, duty, function, duty, ex officio. Synonyms: higroinafectable, higroinatacable, higroinsensible, higroinvulnerable. Antonyms: higroafectable, higroatacable, higrosensible, higrovulnerable.